Inselsbacher, Erich
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
Sammanfattning
Nitrogen (N) availability has a major impact on a wide range of biogeochemical processes in terrestrial ecosystems. Changes in N availability modify the capacity of plants to sequester carbon (C), but despite the crucial importance for our understanding of terrestrial ecosystems, the relative contribution of different N forms to plant N nutrition in the field is not known. Until now, reliably assessing the highly dynamic pool of plant-available N in soil microsites was virtually impossible, because of the lack of adequate sampling techniques. For the first time we have applied a novel microdialysis technique for disturbance-free monitoring of diffusive fluxes of inorganic and organic N in 15 contrasting boreal forest soils in situ. We found that amino acids accounted for 80% of the soil N supply, while ammonium and nitrate contributed only 10% each. In contrast to common soil extractions, microdialysis revealed that the majority of amino acids are available for plant and mycorrhizal uptake. Our results suggest that the N supply of boreal forest soils is dominated by organic N as a major component of plant-available N and thus as a regulator of growth and C sequestration.
Nyckelord
amino acids; diffusive flux; microdialysis; plant nutrition; soil nutrients
Publicerad i
New Phytologist
2012, volym: 195, nummer: 2, sidor: 329-334
Utgivare: WILEY-BLACKWELL
SLU författare
Näsholm, Torgny
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
- Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet
- Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
Globala målen (SDG)
SDG15 Ekosystem och biologisk mångfald
UKÄ forskningsämne
Skogsvetenskap
Publikationens identifierare
- DOI: https://doi.org/10.1111/j.1469-8137.2012.04169.x
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/40659